Composite magnetizable material.



B. H. MESSITER.

COMPOSITE MAGNETIZABLE MATERIAL.

APPLICATION FILED NOV.8,1912.

Patented Dec. 22, 1914.

ATTGRNEY a citizen of the United States, anda resi f UNITED STATES'PATENT OFFICE.

EDWIN H. MESSI'I 'ER'OF BROOKLYN, NEW YORK, ASSIGNOR TO ELECTRIC WEIGHIN COMPANY, OF NEW YORK, N. Y., i

A. CORPORATION OF NEW YORK.

COMPOSITE MAGNETIZA'BLE MATERIAL.

To'aZZ whom it may concern Be it known that I, Eowm H. Mnssrrna,

dent of the borough of Brooklyn, county of Kings, and State of New York, have. in-

vented fcertain new and useful Improvements in Composite'Magnetizable Material, of which the following is a specification, reference being had to the accompanying drawings, forming a part thereof.-

My invention. relates to composite magnetizable materials and it has for itsobject to provide a material of this character that "shall be particularly adapted for the pole pieces of dynamo electric machines and for the core members of other electrical devices; and to a simple and ducing thesame.

In the drawings, Figure 1 is an elevation of a magneto generator having pole pieces I composed of the materialof my invention.

Figs. 2 and 3 are respectively an end elevation and a fragmentary side view on a larger scale, of one of the pole pieces which forms a part of the machine of Fig. 1 Fig: 4; is a sectional elevation and Fig. 5 is a sectional plan view of a mold which may be used in" producing the composite material ofmy. in

vention. Fig. 6 is a view corresponding to Fig. 4 of a modified arrangement of my invention.

Like characters of reference designate corresponding parts in allthe figures.

Referring tothe drawings,-A magneto generator 10 comprises a stationary field frame 11, to which pole pieces 12-12 are I secured, and an armature '13 having commutator brushes 14. The'pole pieces are similar to, eachother and each of them is made of my improved composite magnetiz'able material which may be produced as follows: A large number of pieces of relatively small gage ire of rod such as 15 of iron or-other magnetizable material, are assembled in a mold such as the mold 20 of Fig. 4, on end.

The length of the pieces is determinedby Y the overall length of the pole pieces to be produced (the length of the pole pieces being measured in the direction of the field flux). The wires are preferably circular in cross section and the smallspaces between the wires are filled with molten brass or other brazing material in order to produce an integral structure, or mass, which may be ma- Specification of Letters Patent.

novel process of prochined or finishedin any suitable manner, to the desired'shape and size.

In order to facilitate the brazing processand to insure that themass is solid and the magnetizable wires held'firmly in position, the wires are preferably plated with tin before the molten brass is poured into the Patented Dec. 22, 1914. Application flledNoveniber s, 1912. Serial No. 730,135,-

v A convenient method is to utilize iron wire of the desired gage which has a coating 16 of tin on its surface and to ,then cut the ner and either dipped in molten brass or suspended so that their ends extend into the molten metal. In'either case the capillary action will cause all ofthe interstices of the bundleto be filled with the molten metal.

The material may of course be roduced r in long bars or in a large mass whic may be cut into pieces of the as desired. 4

Mynovel material has the advantage of presenting a resistance to the passage desiredlength and size through it, of magnetic flux in a direction:- transverse-to the magnetizable wires, which is many times in' excess of the reluctance of inned wire into the proper lengths for asthe material of which the wires is composed,

while the resistance to the passage of fiux in a direction longitudinal of the wires is sub-- stantially dependent upon the permeability of the wires themselves; By utilizing this material for pole pieces and other core members of electric apparatus, and forming the core members so that the normal fiuxtends to traverse thematerial in the direction of the wires, it is possible to vei'y largely prevent cross fluxes and thus to avoid the distortive and other injurious effects of such fluxes. For example, by uti lizing the material for pole pieces as shown in Fig. 1, the distortive effect of the arma ture reaction of the dynamo electric machine is largely obviated and the operating characteristics .of the machine materially improved.

It is not only possible to avoid sparking at the commutator brushes of dynamo electric, machines which operate" under varyin con-- ditions of speed and load, but also 0 such consisting of a plurality of magnetizable ins sts":

machines 'as area'dapted fonoperation alj rods or wires coated with metal having a lower melting point and brazed into an integral structure- 1 v 3. A composite magnetizable material consisting of a plurality, of magnetizable rods or wires coated with tin and brazed in parallelism into an integral structure.

4. A composite magnetizable material consisting of a plurality of rods or wires of magnetizable material and a metal bond which holds the rods or wires in" an integral mass.

5. A composite magnetizable materialconsisting of a plurality of magnetizable members assembled in parallelism and -a .non-magnetizable bond united with the magnetizable members to hold them together and to form an integral mass.

6'. A composite magnetizable material.

comprising nie'tds of unlike ermeability united .in an integralmass, with metal of high permeability inaplurality of filaments separated-from eachother by metal of low permeability. Y

7. A process of producing 'a magnetizable material that consists in assembling a group of magnetizable rods or wires in parallelism and filling the interstices with brass in the molten state.

8. A process of producing a magnetizable material that .consistsin assembling a plurality of iron wires of circular cross section in parallelism in a mold and pouring in molten brass to fill the interstices of the bundle.

9. A process of-producing a magnetizable material that consists in coating a magnet;

izable wire with tin, cutting the wire into a plurality' of substantially equal lengths, assembling the lengths in a bundle in parallelism and uniting the tin coated wires'mto an integral structure.

10. A process'of producing a niagnetiz- I able material that consists in'coating a magnetizable wire with metal having a lower melting point, cutting the wire into a plurality of substantially equal lengths, assem bling the lengths in a bundle and uniting the coated wires into an integral structure. In witness whereof, I have hereunto set my hand this 7 day of November, 1912.

EDWIN H. MESSITER.

Witnesses: n

Y F. GRAVES,

G. QUIMBY. 

